Aspen is a common name for certain tree species; some, but not all, are classified by botanists in the section Populus, of the Populus genus. Species. These species are called aspens: Populus adenopoda – Chinese aspen (China, south of P. tremula) Populus davidiana – Korean aspen (Eastern Asia) Populus grandidentata – Bigtooth aspen (eastern North America, south of P. https://en.wikipedia.org/wiki/Aspen